As of my last update, Representative Matt Gaetz has not officially resigned from Congress and is currently under investigation by the House Ethics Committee, as well as the U.S. Justice Department.
The investigations are in regard to potential ethics issues and federal law violations, including allegations of sexual misconduct and possible illegal drug use, among other charges. The congressman from Florida has denied all allegations against him and has stated that he has no plans to resign.
Should Gaetz resign from his position, the House Ethics Committee would likely still discuss their probe into him. However, depending on both the progress of the investigation and the terms of his resignation, its exact impact may change.
Please be aware that this information is up-to-date to the best of my ability, but it is always a good idea to look for the most recent updates from reliable news sources.